escript now supports out-of-tree builds.
All build and test files are now created under a user-definable build_dir
directory.
This also fixes issue 291.
Removed most svn:ignore props since they are no longer required.

The MPI and sequational GAUSS_SEIDEL have been merged.
The couring and main diagonal pointer is now manged by the patternm which means that they are calculated once only even if the preconditioner is deleted.

size_t may be 64 bits which is incompatible to MPI_INT. This problem is fixed by inserting a cast in Mesh_read.c.
Moreover a fix has been added making sure that gmsh and triangle are executed on one processor only.